I downloaded and installed the latest Mozilla Thunderbird today on my Windows 10 laptop and set it up for use with my Zoho mail account. All of the folders show up and all of the emails in those folders show up except the Sent folder. The Sent folder is there but no emails in it. There should be over 100 emails in the folder. I have been using the default WIndows 10 email program and all the emails in the Sent folder do show up there. If I send an email from Thunderbird the email shows up in the Windows email client Sent folder and in the Zoho Sent folder if I sign on to the Zoho web site, but it never shows up in the Thunderbird Sent folder. I have checked all the setting in Thunderbird, I am subscribed to that folder, and its set to sync all emails from all folders with no date restrictions. It works fine on my other Windows 10 laptop. I can't figure it out.